CN116103041A - Carbon dot synthesized by using medicine function retention strategy and preparation method and application thereof - Google Patents

Carbon dot synthesized by using medicine function retention strategy and preparation method and application thereof Download PDF

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CN116103041A
CN116103041A CN202310057486.1A CN202310057486A CN116103041A CN 116103041 A CN116103041 A CN 116103041A CN 202310057486 A CN202310057486 A CN 202310057486A CN 116103041 A CN116103041 A CN 116103041A
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cds
carbon
carbon dots
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liver cancer
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CN116103041B (en
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周艳梅
史佳慧
聂亚敏
张庆友
李永红
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Henan University
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    • A61K49/0063—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres
    • A61K49/0065—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the luminescent/fluorescent agent having itself a special physical form, e.g. gold nanoparticle
    • A61K49/0067—Preparation for luminescence or biological staining characterised by a special physical or galenical form, e.g. emulsions, microspheres the luminescent/fluorescent agent having itself a special physical form, e.g. gold nanoparticle quantum dots, fluorescent nanocrystals
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    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A61K31/16—Amides, e.g. hydroxamic acids
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    • A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
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    • A61K47/54—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being an organic compound
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    • A61K49/00—Preparations for testing in vivo
    • A61K49/001—Preparation for luminescence or biological staining
    • A61K49/0013—Luminescence
    • A61K49/0017—Fluorescence in vivo
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    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00—Manufacture or treatment of nanostructures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
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    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/65—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing carbon
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6447—Fluorescence; Phosphorescence by visual observation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G01N21/6456—Spatial resolved fluorescence measurements; Imaging

Abstract

The invention belongs to the field of medicines, and relates to a carbon dot synthesized by a medicine function retention strategy, and a preparation method and application thereof. The carbon points synthesized by the drug function retention strategy are modified by hydroxyurea and o-phenylenediamine as precursors and mannose. The preparation method comprises the following steps: adding hydroxyurea and o-phenylenediamine into a solvent, performing ultrasonic dissolution, performing heating reaction, filtering after the reaction is finished to obtain a p-CDs solution, washing and centrifuging to obtain a supernatant, and performing rotary evaporation and drying to obtain a p-CDs solid; adding mannose into distilled water for ultrasonic dissolution, performing water bath reaction to obtain mp-CDs solution, filtering, and drying to obtain mp-CDs carbon dots. When the carbon dots are used as liver cancer cell identification and anti-liver cancer reagents, under the irradiation of excitation light, the effect of identifying liver cancer cells by naked eyes can be realized by means of fluorescence of the carbon dots, and the targeting effect of the carbon dots on the liver cancer cells can induce apoptosis of the liver cancer cells, so that damage to normal cells is effectively reduced.

Description

Carbon dot synthesized by using medicine function retention strategy and preparation method and application thereof
Technical Field
The invention belongs to the field of medicines, and relates to a carbon dot synthesized by a medicine function retention strategy, and a preparation method and application thereof.
Background
Whether targeting molecules on nano drug carriers can efficiently identify cancer cells and kill the cancer cells is one of the main challenges of cancer diagnosis and treatment, and common targeting cancer cell carriers include carbon dots, mesoporous silica, high molecular nano particles, metal nanoclusters and the like. The carbon dot is used as a carbon-based nano material with excellent luminescence property, has the advantages of simple preparation, good water solubility, low biotoxicity and the like, and is widely applied to the fields of environmental monitoring, biosensing, drug delivery and the like. Carbon dots with short emission wavelength and low fluorescence quantum yield are easily interfered by the background and have weak tissue penetrating ability, so that the fluorescence carbon dots with longer emission wavelength and high fluorescence quantum yield have more application prospects in the life field. Studies have shown that during solvothermal dehydration carbonization of the carbon dots, some of the reactive functionalities of the precursor molecular structure are retained. Hydroxyurea is an anticancer drug that inhibits DNA synthesis and repair, mainly by inhibiting the production of ribonucleotide reductase. Mannose receptor is an important cancer biomarker, which is abnormally up-regulated in liver cancer cells, and is only present in small amounts in normal cells, which makes it possible to distinguish liver cancer cells by detecting their expression levels. Mannose has high affinity and stability in the microenvironment of cells, is an ideal ligand for mannose receptors, and unlike other nanoparticles, mannose and its nanocomposites are easily internalized into cells by receptor-mediated endocytosis. Patent CN112158826a discloses a carbon dot nano preparation, a preparation method and application thereof. The preparation is characterized in that mannose is used as a carbon dot substrate, ethylenediamine is used as a heat source to provide energy for glucose reaction, and after target products are enriched by an extractant, dialysis is completed by utilizing the concentration difference between a polymer separation membrane and ultrapure water, and then a finished product with uniform particle size is obtained. After the product is injected into tumors, mannose-derived carbon dot finished products (Man-CDs) can effectively capture various histones and the like and tumor related antigens, the activation of Dendritic Cells (DCs) is enhanced by the histones and the like, the dendritic cells present the antigens to T cells, and the T cells complete the killing of the tumor cells. In this patent, when mannose is directly used as a precursor, part of functional groups of mannose are retained during hydrothermal carbonization, but the structure of mannose itself is not complete, resulting in insufficient exertion of the effect of mannose, and the carbon dot does not have the targeted recognition and fluorescence imaging effects on liver cancer cells.
Disclosure of Invention
Aiming at the technical problems, the invention provides a carbon dot synthesized by a drug function retention strategy, and a preparation method and application thereof. The prepared carbon dots can selectively target and identify mannose receptors which are overexpressed on the surfaces of liver cancer cells, and can rapidly enter the cells through endocytosis after being combined. And part of active functional groups of the molecular structure of the hydroxyurea reserved in the carbon point and mannose act in a combined way, so that the drug effect is far greater than that of hydroxyurea which acts independently. Meanwhile, under the irradiation of laser, the invention realizes the technical effect of identifying liver cancer cells by naked eyes by means of the fluorescence property of carbon dots.
In order to achieve the above purpose, the technical scheme of the invention is realized as follows:
the carbon point synthesized by the drug function retention strategy is modified by taking hydroxyurea and o-phenylenediamine as precursors and mannose.
Further, the preparation method of the carbon dots synthesized by the drug function retention strategy comprises the following steps:
(1) preparation of p-CDs carbon dots: adding hydroxyurea and o-phenylenediamine into a solvent for ultrasonic dissolution, then performing heating reaction, filtering, washing and centrifuging after the reaction is finished to obtain a supernatant, evaporating and concentrating the supernatant, and drying to obtain p-CDs carbon dots;
(2) Preparation of mp-CDs carbon dots: adding mannose and the p-CDs carbon dots obtained in the step (1) into distilled water, dissolving at an ultrasonic position, performing water bath reaction, filtering, and drying to obtain the mp-CDs carbon dots, namely the carbon dots synthesized by a medicine function retention strategy.
Further, in the step (1), the mass ratio of hydroxyurea to o-phenylenediamine is 1 (0.28-0.33), the solvent is an aqueous solution of N, N-dimethylformamide, and the volume ratio of N, N-dimethylformamide to water is 1:1.
Further, in the step (1), the heating reaction is carried out in a polytetrafluoroethylene high-pressure reaction kettle, the temperature of the heating reaction is 180-220 ℃, and the time of the heating reaction is 10 hours.
Further, the solvent washed in the step (1) is a mixed solvent of petroleum ether and ethyl acetate, and the volume ratio of petroleum ether to ethyl acetate is 3:1; the centrifugal speed is 7000-9000 r/min, and the centrifugal time is 10min.
Further, in the step (2), the mass ratio of mannose to p-CDs carbon dots is (0.09-0.11): 1, the temperature of the water bath reaction is 20-30 ℃, and the time of the water bath reaction is 9-11 h.
Furthermore, the carbon dots synthesized by the drug function retention strategy are applied to the preparation of fluorescent imaging reagents for targeted identification of liver cancer cells.
Further, the carbon dots synthesized by the drug function retention strategy are applied to the preparation of the reagent for inducing the apoptosis of liver cancer cells.
Further, the application of the carbon dots synthesized by the drug function retention strategy in preparing the fluorescence imaging reagent for targeted identification of liver cancer cells comprises the following steps: adding the mp-CDs carbon dots into PBS buffer solution with pH=7.4 and concentration of 10mM to prepare mp-CDs carbon dot solution with concentration of 2mg/mL, and then adding the mp-CDs carbon dot solution into the cell culture medium to be detected to make the concentration of the mp-CDs carbon dot solution be 15 mug/mL, thus obtaining the fluorescence imaging reagent for targeted identification of liver cancer cells. .
Further, the application of the carbon dots synthesized by the medicine function retention strategy in preparing the reagent for inducing the apoptosis of liver cancer cells comprises the following steps: the mp-CDs carbon spot is added into PBS buffer solution with pH=7.4 and concentration of 10mM to prepare mp-CDs carbon spot solution with concentration of 2mg/mL, and then the mp-CDs carbon spot solution is added into cell culture solution to be tested to obtain the reagent for inducing apoptosis of liver cancer cells with concentration of 50 mug/mL.
The invention has the following beneficial effects:
1. the invention synthesizes pink carbon dots by taking anti-cancer drugs hydroxyurea and o-phenylenediamine as precursors, and obtains mp-CDs carbon dots with diagnosis and treatment effect after modifying the carbon dots by mannose. The problem that mannose is not fully exerted after the mannose is used as a precursor for hydrothermal carbonization in the prior art is avoided, mannose and p-CDs carbon points are connected through electrostatic action by virtue of the modification effect of the mannose, the structure of the mannose is fully reserved, and the efficacy of the mannose is fully exerted.
2. The invention maintains the combination of hydroxyurea active functional groups and mannose, and completes the killing effect on tumor cells through targeting and then treatment. Specific: mp-CDs carbon dots selectively target and identify mannose receptors overexpressed on the surface of liver cancer cells, and after being combined, enter the cells rapidly through endocytosis; then, the hydroxyurea is used for inhibiting the production of ribonucleotide reductase, so that the ribonucleotide is prevented from being reduced to deoxynucleotide, the synthesis of purine and pyrimidine base organisms is interfered, the synthesis of DNA is hindered, and the aim of inducing apoptosis of liver cancer cells is fulfilled. In the invention, after the partial active functional group of the molecular structure of hydroxyurea reserved by mp-CDs carbon points is combined with mannose, the drug effect is far greater than that of hydroxyurea which is singly acted. And under the irradiation of 488nm and 561nm of excitation light and 560nm and 630nm of corresponding emission wavelengths, the naked eye identification of liver cancer cells can be realized by means of the fluorescence performance of carbon dots. The damage to normal cells can be effectively reduced through the targeted identification function of the carbon dots.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a transmission electron micrograph (a) and a particle size distribution (b) of the p-CDs carbon dots prepared in example 1 of the present invention.
FIG. 2 is a fluorescence emission plot of p-CDs carbon dots (a) and mp-CDs carbon dots (b) prepared in example 1 of the present invention.
FIG. 3 shows the hydrated particle size (a) and zeta potential map (b) of p-CDs carbon dots and mp-CDs carbon dots prepared in example 1 of the present invention.
FIG. 4 is a cell imaging diagram of mp-CDs carbon dots prepared in example 1 of the present invention in targeting liver cancer cells, wherein a, b, c, d is two types of normal cell mouse macrophage RAW 264.7 and normal liver cell HL-7702, and two types of tumor cell cervical cancer HeLa cells and liver cancer HepG2; e is the fluorescence intensity of four cell types containing mp-CDs carbon dot solution in the red and green channels.
FIG. 5 is a cell imaging diagram of the p-CDs carbon dots prepared in the embodiment 1 of the invention in targeting liver cancer cells, wherein a, b, c, d is two types of normal cell mouse macrophage RAW 264.7 and normal liver cell HL-7702, and two types of tumor cell cervical cancer HeLa cells and liver cancer HepG2; e is the fluorescence intensity of four types of cells containing p-CDs carbon dot solution in the red and green channels.
FIG. 6 is a graph showing the number of dead cells of liver cancer cells incubated with p-CDs carbon dots and mp-CDs carbon dots prepared in example 1 in Annexin V-APC fluorescence channel (a) and 7-AAD fluorescence channel (b) by flow cytometry analysis.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
The pharmaceutical agents used in the various embodiments of the present invention are all commercially available.
Example 1
A preparation method of a carbon dot synthesized by a medicine function retention strategy comprises the following steps:
(1) preparation of p-CDs carbon dots: 0.1g of hydroxyurea and 0.03g of o-phenylenediamine are placed in a 25mL beaker, dissolved in 10mL of N, N-dimethylformamide water solution with the volume ratio of 1:1, and the mixed solution is subjected to ultrasonic treatment for 10min to enable the precursor to be fully dissolved. The mixed solution was transferred to a 25mL polytetrafluoroethylene autoclave and heated at 200℃for 10 hours, cooled to room temperature, and then the solution was filtered through a 0.22 μm filter membrane to obtain a pure p-CDs solution. Adding excessive petroleum ether and ethyl acetate mixed solution (volume ratio of 3:1) into p-CDs solution to wash off residual organic molecules, and then using 8000r min -1 Centrifuging for 10min, and collecting supernatant for use. The supernatant was concentrated on a rotary evaporator at 60℃and then placed in a vacuum oven at 50℃overnight to give a pink solid of p-CDs.
FIG. 1 shows a transmission electron micrograph (a) and a particle diameter distribution (b) of the p-CDs carbon dots prepared in example 1. As shown in the figure, the p-CDs had uniform particle size, good distribution and no significant aggregation, and had an average diameter of about 11.2nm.
(2) Preparation of mp-CDs carbon dots: dissolving 0.05g of mannose and 0.5g of p-CDs prepared in the step (1) in 10mL of distilled water, and carrying out ultrasonic treatment for 10min to completely dissolve the p-CDs, wherein the temperature is 25 ℃ for 10h in a water bath to obtain an mp-CDs solution. The mp-CDs powder, i.e. the carbon dots synthesized by the drug function retention strategy, was obtained by freeze-drying after filtration with a 0.22 μm filter membrane, with a fluorescence quantum yield of 46%.
Example 2
A preparation method of a carbon dot synthesized by a medicine function retention strategy comprises the following steps:
(1) preparation of p-CDs carbon dots: 0.1g of hydroxyurea and 0.028g of o-phenylenediamine are placed in a 25mL beaker and dissolved in 10mL of N, N-dimethylformamide water solution with the volume ratio of 1:1, and the mixed solution is subjected to ultrasonic treatment for 10min to enable the precursor to be fully dissolved. The mixed solution was transferred to a 25mL polytetrafluoroethylene autoclave and heated at 180℃for 10 hours, cooled to room temperature, and then the solution was filtered through a 0.22 μm filter membrane to obtain a pure p-CDs solution. Excess petroleum ether and ethyl acetate mixed solution (volume ratio of 3:1) was added to the p-CDs solution to wash off residual organic molecules, followed by 9000r min -1 Centrifuging for 10min, and collecting supernatant for use. The supernatant was concentrated on a rotary evaporator at 60℃and then placed in a steam vacuum oven at 50℃overnight to give a pink solid of p-CDs.
(2) Preparation of mp-CDs carbon dots: dissolving 0.045g of mannose and 0.5g of p-CDs prepared in the step (1) in 10mL of distilled water, and carrying out ultrasonic treatment for 10min to completely dissolve the p-CDs, wherein the mp-CDs solution is obtained in a water bath at 20 ℃ for 9 h. Filtering with 0.22 μm filter membrane, and lyophilizing to obtain mp-CDs powder, i.e. carbon dots synthesized by drug function retention strategy.
Example 3
A preparation method of a carbon dot synthesized by a medicine function retention strategy comprises the following steps:
(1) preparation of p-CDs carbon dots: 0.1g of hydroxyurea and 0.032g of o-phenylenediamine are placed in a 25mL beaker, dissolved in 10mL of N, N-dimethylformamide water solution with the volume ratio of 1:1, and the mixed solution is subjected to ultrasonic treatment for 10min to enable the precursor to be fully dissolved. The mixed solution was transferred to a 25mL polytetrafluoroethylene autoclave and heated at 220℃for 10 hours, cooled to room temperature, and then the solution was filtered through a 0.22 μm filter membrane to obtain a pure p-CDs solution. Excess petroleum ether and ethyl acetate mixed solution (volume ratio of 3:1) was added to the p-CDs solution to wash off residual organic molecules, followed by a rotation of 6000r min -1 Centrifuging for 10min, and collecting supernatant for use. Placing the supernatant in a containerConcentrated on a rotary evaporator at 60℃and then placed in a vacuum oven at 50℃overnight to give a pink solid of p-CDs.
(2) Preparation of mp-CDs carbon dots: 0.0605g of mannose and 0.5g of p-CDs prepared in the step (1) are dissolved in 10mL of distilled water, and are subjected to ultrasonic treatment for 10min to completely dissolve, and water bath is carried out at 25 ℃ for 11h, so that mp-CDs solution is obtained. Filtering with 0.22 μm filter membrane, and lyophilizing to obtain mp-CDs powder, i.e. carbon dots synthesized by drug function retention strategy.
Performance testing
(1) The p-CDs carbon dots and mp-CDs carbon dots prepared in example 1 were dissolved in PBS buffer solution having pH=7.4, respectively, to prepare a carbon dot solution of 2 mg/mL. 2.5mL of the solution was added to a fluorescence cuvette and detected on a fluorescence photometer, and the excitation wavelength was increased from 420nm to 560nm.
FIG. 2 is a fluorescence emission plot of p-CDs carbon dots (a) and mp-CDs carbon dots (b) prepared in example 1 of the present invention. As shown in FIG. 2, the emission wavelengths of the p-CDs carbon dots and the mp-CDs carbon dots are almost unchanged. It was shown that modification of mannose did not affect the optical properties of p-CDs.
(2) The p-CDs and mp-CDs prepared in example 1 were dissolved in PBS buffer solution having pH=7.4 to prepare 0.5mg/mL solutions, and then filtered with a 0.22 μm filter. The liquid phase particle diameters and zeta potential of p-CDs and mp-CDs were measured in a laser particle size and zeta potential analyzer.
FIG. 3 shows the hydrated particle size (a) and zeta potential map (b) of p-CDs carbon dots and mp-CDs carbon dots prepared in example 1 of the present invention. As shown in FIG. 3, the hydrated particle size of the mp-CDs carbon dots was significantly higher than that of the p-CDs carbon dots, and the zeta potentials of the p-CDs carbon dots and the mp-CDs carbon dots were-24.4 eV and 1.25eV, respectively, and the increase in electronegativity of the mp-CDs carbon dots and the increase in hydrated particle size indicated that mannose was successfully bonded to the p-CDs carbon dots.
Application example 1
The application of carbon dots (mp-CDs carbon dots) synthesized by the drug function retention strategy in the fluorescent imaging reagent for targeted identification of liver cancer cells comprises the following steps:
a PBS buffer solution at a concentration of 10mM at ph=7.4 was prepared; taking the mp-CDs carbon spot prepared in example 1 as an example, a PBS solution of 2mg/mL of the mp-CDs carbon spot was preparedThe method comprises the steps of carrying out a first treatment on the surface of the The mp-CDs carbon dot solution was added to the cell culture broth to a concentration of 15. Mu.g/mL. With two kinds of normal cell mice macrophage RAW 264.7 and normal liver cell HL-7702 and two kinds of tumor cell cervical cancer HeLa cell and liver cancer HepG2 at 37deg.C CO 2 Incubation was performed in a 5% incubator for 1h. After incubation, the cells were washed three times with PBS (ph=7.4), then 1mL of serum-free DMEM medium was added and placed in a confocal dish, excitation wavelengths were set at 488nm and 561nm, respectively, under a confocal microscope, and corresponding cell imaging patterns were taken at emission wavelengths of 560nm and 630nm, respectively.
FIG. 4 is a cell imaging diagram of mp-CDs carbon dots prepared in example 1 of the present invention in targeting liver cancer cells, wherein a, b, c, d is two types of normal cell mouse macrophage RAW 264.7 and normal liver cell HL-7702, and two types of tumor cell cervical cancer HeLa cells and liver cancer HepG2; e is the fluorescence intensity of four cell types containing mp-CDs carbon dot solution in the red and green channels. As shown in FIG. 4, mp-CDs carbon dots exhibited distinct fluorescence in the red and green channels of HepG2 cells, but weak fluorescence in other cells. Thus, the mp-CDs carbon dots can be used for targeting liver cancer cell imaging.
Application example 1 comparative example
The application of the p-CDs carbon dots in the fluorescent imaging reagent for targeted identification of liver cancer cells comprises the following steps:
a PBS buffer solution at a concentration of 10mM at ph=7.4 was prepared; taking the p-CDs carbon spot prepared in example 1 as an example, preparing a PBS solution of 2mg/mL of the p-CDs carbon spot; the p-CDs carbon dot solution was added to the cell culture medium to a concentration of 15. Mu.g/mL. With two kinds of normal cell mice macrophage RAW 264.7 and normal liver cell HL-7702 and two kinds of tumor cell cervical cancer HeLa cell and liver cancer HepG2 at 37deg.C CO 2 Incubation was performed in a 5% incubator for 1h. After incubation, the cells were washed three times with PBS (ph=7.4), then 1mL of serum-free DMEM medium was added and placed in a confocal dish, excitation wavelengths were set at 488nm and 561nm, respectively, under a confocal microscope, and corresponding cell imaging patterns were taken at emission wavelengths of 560nm and 630nm, respectively.
FIG. 5 is a cell imaging diagram of the p-CDs carbon dots prepared in the embodiment 1 of the invention in targeting liver cancer cells, wherein a, b, c, d is two types of normal cell mouse macrophage RAW 264.7 and normal liver cell HL-7702, and two types of tumor cell cervical cancer HeLa cells and liver cancer HepG2; e is the fluorescence intensity of four types of cells containing p-CDs carbon dot solution in the red and green channels. As shown in FIG. 5, no obvious fluorescence appears in the channels of the four types of cells at the p-CDs carbon point, which indicates that the p-CDs carbon point serving as a control probe does not have the capability of targeting liver cancer cells.
Application example 2
The application of the carbon dots synthesized by the drug function retention strategy in the reagent for inducing the apoptosis of liver cancer cells comprises the following steps:
a PBS buffer solution at a concentration of 10mM at ph=7.4 was prepared; taking the p-CDs carbon dots and the mp-CDs carbon dots prepared in example 1 as examples, 2mg/mL PBS solutions of the p-CDs carbon dots and the mp-CDs were prepared respectively; the carbon dot solution was added to the cell culture broth to a concentration of 50. Mu.g/mL. P-CDs carbon dots and mp-CDs carbon dots and HepG2 cells at 37℃CO 2 In an incubator with a concentration of 5%, the cells are collected after 24 hours incubation and digestion and centrifugation. Then resuspended in 100. Mu.L buffer, stained with 5. Mu.L Annexin V-APC and 10. Mu.L 7-AAD, respectively, and incubated for 5min at room temperature. And finally, analyzing the apoptosis conditions of different cell samples by adopting a flow cytometer.
FIG. 6 is a graph showing the number of dead cells of liver cancer cells incubated with p-CDs carbon dots and mp-CDs carbon dots prepared in example 1 in Annexin V-APC fluorescence channel (a) and 7-AAD fluorescence channel (b) by flow cytometry analysis. As shown in FIG. 6, the number of lethal cells induced by mp-CDs carbon dots was significantly higher than that of p-CDs carbon dots in Annexin V-APC and 7-AAD fluorescent channels. Induction of apoptosis indicates that mp-CDs carbon dots have potential therapeutic effects on hepatoma cells.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims (10)

1. A carbon dot synthesized with a drug function retention strategy, characterized by: the carbon point synthesized by the drug function retention strategy is modified by hydroxyurea and o-phenylenediamine as precursors and mannose.
2. The method for preparing a carbon dot synthesized by a drug function retention strategy according to claim 1, comprising the steps of:
(1) preparation of p-CDs carbon dots: adding hydroxyurea and o-phenylenediamine into a solvent for ultrasonic dissolution, then performing heating reaction, filtering, washing and centrifuging after the reaction is finished to obtain a supernatant, evaporating and concentrating the supernatant, and drying to obtain p-CDs carbon dots;
(2) Preparation of mp-CDs carbon dots: adding mannose and the p-CDs carbon dots obtained in the step (1) into distilled water, dissolving at an ultrasonic position, performing water bath reaction, filtering, and drying to obtain the mp-CDs carbon dots, namely the carbon dots synthesized by a medicine function retention strategy.
3. The method for preparing a carbon dot synthesized with a drug function retention strategy according to claim 2, wherein: in the step (1), the mass ratio of hydroxyurea to o-phenylenediamine is 1 (0.28-0.33), the solvent is an N, N-dimethylformamide aqueous solution, and the volume ratio of N, N-dimethylformamide to water is 1:1.
4. A method for preparing a carbon dot synthesized with a drug function retention strategy according to claim 2 or 3, characterized in that: the heating reaction in the step (1) is carried out in a polytetrafluoroethylene high-pressure reaction kettle, the temperature of the heating reaction is 180-220 ℃, and the time of the heating reaction is 10 hours.
5. The method for preparing a carbon dot synthesized with a drug function retention strategy according to claim 4, wherein: the solvent washed in the step (1) is a mixed solvent of petroleum ether and ethyl acetate, and the volume ratio of petroleum ether to ethyl acetate is 3:1; the centrifugal speed is 7000-9000 r/min, and the centrifugal time is 10min.
6. The method for preparing a carbon dot synthesized with a drug function retention strategy according to any one of claims 2, 3 or 5, wherein: the mass ratio of mannose to p-CDs carbon point in the step (2) is (0.09-0.11): 1, the temperature of the water bath reaction is 20-30 ℃, and the time of the water bath reaction is 9-11 h.
7. The use of the carbon dots synthesized by the drug function retention strategy as claimed in claim 1 for preparing a fluorescence imaging reagent for targeted recognition of liver cancer cells.
8. The use of the carbon dots synthesized with the drug function retention strategy as claimed in claim 1 for preparing an agent for inducing apoptosis of liver cancer cells.
9. The use according to claim 7, characterized in that: adding the mp-CDs carbon dots into PBS buffer solution with pH=7.4 and concentration of 10mM to prepare mp-CDs carbon dot solution with concentration of 2mg/mL, and then adding the mp-CDs carbon dot solution into the cell culture medium to be detected to make the concentration of the mp-CDs carbon dot solution be 15 mug/mL, thus obtaining the fluorescence imaging reagent for targeted identification of liver cancer cells.
10. The use according to claim 8, characterized in that: the mp-CDs carbon spot is added into PBS buffer solution with pH=7.4 and concentration of 10mM to prepare mp-CDs carbon spot solution with concentration of 2mg/mL, and then the mp-CDs carbon spot solution is added into cell culture solution to be tested to obtain the reagent for inducing apoptosis of liver cancer cells with concentration of 50 mug/mL.
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